01-30-2024, 03:59 PM | #1 |
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Swapping Out KW Springs for Swift Springs
GTS suspension question - looking to upgrade to Swift springs and noticed that the Swifts are 60mm ID while the KWs are 61mm. For those of you who have performed this swap, what spring perches and isolators did you use?
Thanks. Last edited by markw10702; 02-05-2024 at 05:32 PM.. |
02-02-2024, 03:28 PM | #2 |
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Just the stock perches. The Swift's are flat top and bottom though so you should remove the plastic/rubber adapter. FYI the stock springs that come on the KW's are actually Eibach.
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02-02-2024, 03:34 PM | #3 |
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I'd love to see some part numbers for replacement springs on the GTS
I'm sure the stock valving can go up 150lbs front and rear, but what are the lengths and part numbers? |
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02-02-2024, 03:53 PM | #4 |
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02-02-2024, 03:54 PM | #5 | |
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Thanks. Last edited by markw10702; 02-02-2024 at 04:26 PM.. |
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02-02-2024, 04:28 PM | #6 |
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02-02-2024, 04:55 PM | #7 |
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Here are the part numbers for the Swift's I went with, 8" rear and 7" front however if I were to do it again I'd do a 6" front because with the Swift assist springs I put in the front is as low as it will go and I could use a bit more adjustment. As far as rates I did 16k rear and 11k front which puts them right about 200 lbs over stock which is what KW says will work with stock valving:
Z60-178-110 Z60-203-160 |
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02-02-2024, 04:58 PM | #8 |
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Pic for comparison (front springs)
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02-02-2024, 10:22 PM | #9 |
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Super useful, much appreciated
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02-02-2024, 10:24 PM | #10 | |
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+200lbs gets us into better territory. The kw 3w is a good suspension, but the spring rates in the GTS are ridiculously low |
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02-02-2024, 10:35 PM | #11 |
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Why didn’t you increase the F and R springs the same % from gts stock rates? Your front rate is 69% of your rear rate whereas stock gts it is 58%. Are you concerned about adding understeer?
Last edited by M3SQRD; 02-03-2024 at 12:04 AM.. |
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02-02-2024, 11:47 PM | #12 | ||
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Last edited by Track/S; 02-02-2024 at 11:54 PM.. |
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02-03-2024, 12:03 AM | #13 |
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02-03-2024, 03:14 PM | #14 |
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From what I remember:
GTS comes with 400lb/in front and 685lb/in rear springs. Stock KW CS 3W are 575lb/in front and 800lb/in rear. When I reached out to a kw dealer, they reached out to kw and got this: "According to KW, you would need 457 lbs/in front springs and 914 lbs/in rear springs"
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02-03-2024, 03:38 PM | #15 | ||
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02-03-2024, 03:46 PM | #16 |
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From one of their dealers. Who knows if it's right! But the regular cs 3w should be real information
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02-03-2024, 04:05 PM | #17 |
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02-03-2024, 04:15 PM | #18 | |
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02-05-2024, 01:08 PM | #19 |
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That's the main reason, I have been trying to dial out the understeer since I got it (mostly with alignment and square tires) especially since I started out tracking in the very oversteer-y S2000. These rates have worked well for me, but always open to hearing other's experience and feedback.
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02-05-2024, 01:46 PM | #20 | |
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If you’re trying to dial out understeer you’d want to raise the rear rate more than the front rate. You increased the front rate by 11% relative to the rear. I’d expect something closer to 50% F-R ratio vs. the GTS stock 59%. However, with stock ASBs, the higher front rate could be providing better front role control and better maintaining of the front camber curve, therefore reducing understeer? With my MCS 2WR I’m currently running F/R 700/1100 lbf/in rates and the balance is great with 63% F-R ratio which supports the increase in front rate relative to rear, does dial out understeer. Have you had a chance to really test the new spring rates? |
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02-11-2024, 05:17 PM | #22 | |
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